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Batch#01 - 24 Dec - Day 15

Christmas Eve! Time to find out more about lettuce tip burn


Signs of tip burns (especially at the crown or youger leaves)



More signs of tip burn only on the GR. Interestingly, the other lettuces do not exhibit any similar signs. This may point to other causes, other than EC level, pH or even dew droplets. An important point to note is that GR leaves are much thinner and seemingly more fragile compared to the other lettuces in the system.

An internet search yielded this article. 

To summarize the key points of the article, it would seem that tip burn can be caused by calcium deficiency. However, for selected lettuce (iceberg), tip burn at the crown or young leaves, can still happen despite sufficient calcium supply. This is most likely caused by rapid growth which creates a condition that reduces the transpiration ability in the inner leaves. This lack of evapotranspiration is the main cause of tip burn in selected lettuce types.

 The only way to manage is to cultivate other types of lettuce apparently!

So it seems I just got to live with the issue. More important to note, is to keep vigilant and check that the tip burns or identical looking signs are not caused by other factors, such as pest infestation or moulds!

The traditional sequence from top to bottom.

CR:


GR:



RO:



BH:



EC980
- Still in good range.

pH6.7
- The trend of increasing pH remains consistent. Added 4 drops of pH down around 0800h. Reading at 1700h is 6.6. Added another 4 drops.

WT29
- Fairly consistent between 29 and 30C.






 



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